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Otosclerosis is a medical condition where the bone surrounding the inner ear, and the middle ear grows significantly, immobilizing the stirrup (the middle ear’s bone attaches to the inner ear), so that it may not transmit sounds adequately. Otosclerosis is a hereditary disorder and is the most common conductive progressive hearing loss cause in adults with normal eardrums. It also may result in a normal hearing loss if the growth of the bone pinches and injures the nerve, that is connecting the iner ear with the person’s brain. Approx 10% of white adults have some signs of otosclerosis, but only approx. 1% progress loss of conductive hearing as a result. Otosclerosis first becomes evident, in early adulthood or late adolescence. Stirrup may be removed by microsurgery and replaced with an artificial stirrup; such surgery restores hearing in many cases. Some individuals can use a hearing aid instead of having a surgery.
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